CN212272530U - Electric oil pump - Google Patents

Abstract

The utility model provides an electric oil pump (1) can improve and install electric oil pump (1) in the installation operation nature when installing the object. A1 st body (57) of a pump body (51) comprises: a mounting surface (57p) that is mounted to a mounting object of the electric oil pump (1); and a positioning recess (57q) for positioning the electric oil pump (1) with respect to the mounting object, wherein at least one of the suction port (57j) and the discharge port (57k) is open toward the axial front side, the mounting surface (57p) is open toward the axial front side, and the positioning recess (57q) is provided on the mounting surface (57 p).

Description

Electric oil pump

Technical Field

The utility model relates to an electric oil pump.

Background

Conventionally, there are known electric oil pumps as follows: the electric oil pump includes a pump section and a motor section for driving the pump section, and a pump body for housing a pump rotor includes a suction port for sucking oil and a discharge port for discharging oil.

For example, an electric oil pump described in patent document 1 includes a pump section and a motor section, and includes a pump cover and a pump housing as a pump body of the pump section that houses a pump rotor. The pump section is disposed on one side of the pump section in the axial direction of the motor shaft. The pump housing has a suction port that sucks in oil and a discharge port that discharges the oil.

Patent document 1: japanese laid-open patent publication No. 2015-163029

When the electric oil pump described in patent document 1 is mounted to a mounting object such as a transmission, it is necessary to perform not only an operation of fixing the electric oil pump to the mounting object but also a piping operation. Specifically, it is necessary to perform an operation of connecting the suction port of the electric oil pump to the oil delivery portion to be mounted by a pipe. Further, it is necessary to perform an operation of connecting the discharge port of the electric oil pump to the oil receiving port of the mounting object by a pipe. Thus, the electric oil pump described in patent document 1 has a problem that the trouble of piping work deteriorates the workability of mounting the electric oil pump.

SUMMERY OF THE UTILITY MODEL

In view of the above-described background, an object of the present invention is to provide an electric oil pump that can improve the mounting workability when mounting the electric oil pump to a mounting target.

An exemplary utility model of aspect 1 of the present application is an electric oil pump having: a pump section; and a motor unit configured to drive the pump unit, the pump unit being disposed on one side of the motor unit in an axial direction of a motor shaft, the pump unit including a pump rotor and a pump body that houses the pump rotor, the pump body including a suction port that sucks in oil and a discharge port that discharges oil, the pump unit including: a mounting surface to be mounted on a mounting object of the electric oil pump; and a positioning portion that positions the electric oil pump with respect to the mounting object, at least one of the suction port and the discharge port being open toward one axial side, the mounting surface being open toward one axial side, the positioning portion being provided on the mounting surface.

Preferably, the suction port and the discharge port are open to one axial side, respectively.

Preferably, the pump body has a circular convex portion protruding from the mounting surface toward one side in an axial direction, and the suction port and the discharge port are disposed on one side in the axial direction of the convex portion and on a radially inner side of a circumference of the circular convex portion.

Preferably, the circular convex portion has an annular groove extending over the entire circumference of the circumferential surface.

Preferably, the positioning portion is disposed on the mounting surface at a position radially outward of the convex portion.

Preferably, the attachment surface has a plurality of bolt holes through which bolts for fixing the pump body to the attachment object pass, and the positioning portion is disposed between a bolt hole located radially outward most from a center point of a diameter of the convex portion among the plurality of bolt holes and the convex portion.

Preferably, the positioning portion is a positioning convex portion protruding from the mounting surface toward one axial side, or a positioning concave portion recessed from the mounting surface toward the other axial side, and a height of the positioning convex portion or a depth of the positioning concave portion is larger than a distance from the mounting surface to an end of the groove on one axial side.

Preferably, the pump body has a 2 nd convex portion, the 2 nd convex portion projecting from one axial end surface of a 1 st convex portion, which is a circular convex portion, toward one axial side, the 2 nd convex portion being disposed radially inward of a circumference of the 1 st convex portion, the 2 nd convex portion having a rotor chamber that houses the pump rotor, and the suction port and the discharge port being provided on one axial end surface of the 2 nd convex portion, respectively.

According to the exemplary embodiment of claim 1 of the present application, the mounting workability when mounting the electric oil pump to the mounting object can be improved.

Drawings

Fig. 1 is a perspective view illustrating an electric oil pump of an embodiment.

Fig. 2 is a longitudinal sectional view showing a sectional surface at a position of a central axis J of the electric oil pump.

Fig. 3 is a perspective view showing a pump rotor of a pump portion of the electric oil pump.

Fig. 4 is a perspective view showing the electric oil pump in a state where the 1 st main body of the pump section is cut in the Y-Z direction as viewed from the front side.

Fig. 5 is a perspective view showing the 1 st body viewed from the rear side.

Fig. 6 is an exploded perspective view of the electric oil pump showing a state in which the pump section is exploded.

Fig. 7 is an exploded perspective view of the electric oil pump showing a state in which the pump section is exploded from a different angle from fig. 6.

Fig. 8 is a perspective view showing the 1 st body and the partition plate of the electric oil pump.

Description of the reference symbols

1: an electric oil pump; 10: a motor section; 11: a motor; 12: a shaft (motor shaft); 13: a motor housing; 14: an electric fitting cover; 20: a rotor; 22: a stator; 40: a pump section; 47: a pump rotor; 51: a pump body; 52: a 2 nd body; 52 a: the 1 st communicating oil way; 52 b: the 2 nd communication oil way; 52 c: a rear-side discharge oil path; 55: a bearing; 57: a 1 st body; 57 a: a rotor chamber (oil path); 57 b: a suction oil path; 57 c: discharging an oil path; 57 e: a front side discharge oil path; 57 f: a discharge port; 57 g: an inflow port; 57 h: a detection port; 57 j: a suction inlet; 57 k: an outlet port; 57 n: an outlet port; 57 p: a mounting surface; 57 q: a positioning recess (positioning portion); 57 r: the 1 st convex part; and 57 s: a 2 nd convex part; 57 t: a circular groove; 58: a partition plate; 58 a: a central opening; 58 b: the suction side is open; 58 c: a discharge side opening; 58 d: an opening for discharge; 58 e: 1, positioning holes; 58 f: 2 nd positioning hole; 59: 1 st sealing member; 60: and (2) a sealing member.

Detailed Description

Hereinafter, an electric oil pump according to an embodiment of the present invention will be described with reference to the drawings. In the drawings below, for convenience of understanding of the respective structures, the actual structures may be different in scale, number, and the like from those of the respective structures.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the X-axis direction is a direction parallel to the axial direction of the central axis J shown in fig. 1 and 2. The Y-axis direction is a direction parallel to the short side direction of the electric oil pump shown in fig. 1. The Z-axis direction is a direction perpendicular to both the X-axis direction and the Y-axis direction.

In the following drawings, when arrows are drawn along the X-axis direction, the Y-axis direction, and the Z-axis direction, the side to which the arrow is directed is the + side, and the side to which the arrow is not directed is the-side.

In the following description, the positive side (+ X side) in the X axis direction is referred to as "front side", and the negative side (-X side) in the X axis direction is referred to as "rear side". The front side and the rear side are only names for explanation, and do not limit the actual positional relationship and direction. The axial front side is equivalent to the axial side of the utility model. The axial rear side is equivalent to the axial opposite side of the utility model.

Unless otherwise specified, a direction parallel to the central axis J (X-axis direction) is simply referred to as "axial direction", a radial direction about the central axis J is simply referred to as "radial direction", and a circumferential direction about the central axis J (i.e., a direction around the central axis J) (θ direction) is simply referred to as "circumferential direction".

In addition, in the present specification, "extend in the axial direction" includes a case of extending in a direction inclined in a range of less than 45 ° with respect to the axial direction, in addition to a case of strictly extending in the axial direction (X-axis direction). In addition, in this specification, "extend in the radial direction" includes, in addition to a case of extending strictly in the radial direction (i.e., a direction perpendicular to the axial direction (X-axis direction)), a case of extending in a direction inclined in a range of less than 45 ° with respect to the radial direction.

< integral Structure >

Fig. 1 is a perspective view showing an electric oil pump 1 of the embodiment. As shown in the drawing, the electric oil pump 1 includes a motor portion 10 and a pump portion 40.

Fig. 2 is a longitudinal sectional view showing a sectional surface at a position of the central axis J of the electric oil pump 1. The central axis J is an axis along the axial center of the shaft 12 (motor shaft) of the motor 11 included in the motor unit 10. The motor unit 10 includes a shaft 12 disposed along a central axis J extending in the axial direction. The pump section 40 is located on one axial side (front side) of the motor section 10, and draws and discharges oil when driven by the motor section 10 via the shaft 12. Hereinafter, each structural member will be described in detail.

< motor part 10 >

As shown in fig. 2, the motor unit 10 includes a shaft 12, a rotor 20, a stator 22, a motor housing 13, an electric component cover 14, and a circuit board 15.

The motor unit 10 is, for example, an inner rotor type motor. The rotor 20 is fixed to the outer peripheral surface of the shaft 12, and the stator 22 is located radially outward of the rotor 20.

(Motor case 13)

The motor housing 13 is made of metal. The motor case 13 has a bottomed cylindrical shape having a bottom portion 13f on the other side (rear side) in the axial direction. The inner circumferential surface of the motor housing 13 extending in the circumferential direction functions as a stator holding portion that holds the stator 22. An outer surface of the stator 22 (i.e., an outer surface of a core back 22a described later) is fitted to an inner peripheral surface of the motor housing 13. The stator 22 is fitted and housed in the motor housing 13 as described above.

(rotor 20)

The rotor 20 has a rotor core 20a and a rotor magnet 20 b. Rotor core 20a surrounds shaft 12 around the axis (θ direction) and is fixed to shaft 12. Rotor magnet 20b is fixed to an outer surface of rotor core 20a around the axis (in the θ direction). The rotor core 20a and the rotor magnet 20b rotate together with the shaft 12. The rotor 20 may be an embedded magnet type in which a permanent magnet is embedded in the rotor 20. The embedded magnet type rotor 20 can reduce the possibility of the magnets being separated by centrifugal force and can actively utilize reluctance torque, as compared with the surface magnet type in which permanent magnets are provided on the surface of the rotor 20.

(stator 22)

The stator 22 surrounds the rotor 20 about an axis (θ direction) and rotates the rotor 20 about the center axis J. The stator 22 includes a core back 22a, a coil 22b, and an insulator (bobbin) 22 d.

The core back 22a is cylindrical and concentric with the shaft 12. The coil 22b is provided around an insulator (bobbin) 22d, and a conductive wire 22e is wound around the coil.

(shaft 12)

The shaft 12 extends along the center axis J and penetrates the motor unit 10. The front side (+ X side) of the shaft 12 protrudes from the motor section 10 and extends into the pump section 40. The front side in the axial direction of the shaft 12 is rotatably supported by a bearing 55 described later in the pump section 40. The rear side in the axial direction of the shaft 12 is rotatably supported by a bearing 24 disposed at the rear side in the axial direction of the rotor 20. Therefore, the shaft 12 is supported at both ends.

(Circuit board 15)

The circuit board 15 is fixed to the outer surface of the bottom portion 13f of the motor housing 13. A hall IC for a hall sensor that detects the rotation angles of the shaft 12 and the rotor 20, and the like are mounted on the circuit board 15. In addition, the circuit board 15 has a power supply terminal for supplying power to the hall sensor, a GND terminal, and a 1 st hall signal terminal, a 2 nd hall signal terminal, and a 3 rd hall signal terminal for outputting hall signals.

(Electrical fitting cover 14)

The electric component cover 14 is a bottomed cylindrical cover having a bottom at an end portion on the rear side in the axial direction. The electric cover 14 covers the circuit board 15 in a state of being fitted and fixed to the motor housing 13. The electrical enclosure 14 has a connector 14 a. The connector 14a is inserted with an external connector for electrically connecting an external device and an external power source to the respective terminals of the circuit board 15 and the U-phase terminal, the V-phase terminal, and the W-phase terminal of the motor 11 as power input terminals.

< Pump part 40 >

The pump section 40 is located on one axial side (front side) of the motor section 10. The pump section 40 is driven by the motor section 10 via the shaft 12. The pump section 40 has a pump rotor 47 and a pump body 51. The pump body 51 has a 1 st body 57 and a 2 nd body 52. In the pump section 40, the 1 st body 57 is disposed on the axial front side of the 2 nd body 52. Hereinafter, each member will be described in detail.

(Pump rotor 47)

The pump rotor 47 is mounted on the front side in the axial direction of the shaft 12 and rotates together with the shaft 12.

Fig. 3 is a perspective view showing the pump rotor 47. The pump rotor 47 has: an inner rotor 47a attached to the shaft 12; and an outer rotor 47b surrounding a radially outer side of the inner rotor 47 a. The inner rotor 47a has an annular shape. The inner rotor 47a is a gear having teeth on the radially outer side.

The end of the shaft 12 on the axial front side (+ X side) enters the inside of the inner rotor 47 a. The front end of the shaft 12 may be inserted or press-fitted into the inner rotor 47 a. The inner rotor 47a rotates together with the shaft 12 about the axis (θ direction). The outer rotor 47b is annular in shape surrounding the radially outer side of the inner rotor 47 a. The outer rotor 47b is a gear having teeth on the radially inner side.

The inner rotor 47a and the outer rotor 47b are engaged with each other, and the outer rotor 47b is rotated by rotating the inner rotor 47 a. That is, the pump rotor 47 is rotated by the rotation of the shaft 12.

If attention is paid to 1 meshing portion of the inner rotor 47a and the outer rotor 47b, the volume of the region between the meshing portions varies depending on the rotational position of the pump rotor 47. The region where the volume reduction occurs in the rotation direction is the discharge-side region DA of the rotor chamber (57 a of fig. 5). In the discharge-side region DA, the oil between the meshing portions is pressurized, thereby generating a discharge force of the oil toward the outside of the pump portion 40. On the other hand, the region where the volume increase is generated is the suction side region SA of the rotor chamber (57 a of fig. 5). In the suction side area SA, the oil between the mesh portions is decompressed, thereby generating a suction force of the oil toward the inside of the pump portion 40.

The discharge-side region DA and the suction-side region SA in fig. 3 do not indicate a circumferential region of the pump rotor 47, but indicate regions centered on the central axis (J in fig. 2). Thus, even when the pump rotor 47 rotates, the positions of the discharge-side area DA and the suction-side area SA do not change.

(Pump body 51)

As shown in fig. 2, the pump body 51 has a 1 st body 57 and a 2 nd body 52. The base of each of the 1 st body 57 and the 2 nd body 52 is made of, for example, a cast product of aluminum.

(1 st body 57)

Fig. 4 is a perspective view showing the electric oil pump 1 in a state where the 1 st main body 57 is cut in the Y-Z direction as viewed from the front side. The cross-sectional view shown in fig. 2 shows a cross-sectional view at the position of the one-dot chain line of fig. 4 from the-Y side. As shown in fig. 4, a spool 65 and a check valve 66 are disposed in the 1 st body 57.

The 1 st sleeve 65a, which is a part of the spool 65, is an undercut groove provided to the 1 st body 57. The spool 65 includes a spool body 65b, a coil spring 65c, and a spring receiving body 65d in addition to the 1 st sleeve 65 a. The spool body 65b is housed in the 1 st sleeve 65a and is capable of reciprocating in the sleeve longitudinal direction. The coil spring 65c biases the spool valve body 65b in the direction of arrow α in the figure. The spring receiving body 65d receives an end portion of the coil spring 65c in the direction opposite to the arrow α direction.

The 2 nd sleeve 66a, which is a part of the check valve 66, is an undercut groove provided to the 1 st body 57. The check valve 66 has a check valve body 66b of a regular spherical shape in addition to the 2 nd sleeve 66 a. The check valve body 66b prevents the oil in the 2 nd sleeve 66a from moving in the direction of arrow β in the figure. The discharge side of the check valve 66 is connected to the upstream end of the discharge oil passage 57 e.

Fig. 5 is a perspective view showing the 1 st body 57 viewed from the rear side. The cross section shown in fig. 2 shows a cross-sectional surface at the position of the chain line of fig. 5 from the-Y side in the Y-axis direction. As shown in fig. 5, the 1 st body 57 has a rotor chamber 57a, a suction oil passage 57b, a discharge oil passage 57c, a center recess 57d, a front side discharge oil passage 57e, a discharge port 57f, an inflow port 57g, a detection port 57h, and an annular groove 57 i.

The rotor chamber 57a is a circular recess that houses the pump rotor (47 in fig. 3). The suction oil passage 57b has a recess 57b1 and a through hole 57b 2. The recessed portion 57b1 of the suction oil passage 57b is recessed toward the front side from the bottom surface of the rotor chamber 57 a. The shape of the suction oil passage 57b is an arc shape extending in the circumferential direction with the center axis J as the center. The through hole 57b2 of the suction oil passage 57b axially penetrates the 1 st body 57 from the bottom surface of the recessed portion 57b1 toward the front side. The intake oil passage 57b axially faces the intake-side region SA shown in fig. 3.

In fig. 5, the discharge oil passage 57c located on the + Z side of the suction oil passage 57b includes a recess 57c1 and a through hole 57c 2. The concave portion 57c1 of the discharge oil passage 57c is recessed toward the front side from the bottom surface of the rotor chamber 57 a. The shape of the discharge oil passage 57c is an arc shape extending in the circumferential direction with the center axis J as the center. The through hole 57c2 of the discharge oil path 57c axially penetrates the 1 st body 57 from the bottom surface of the recess 57c1 toward the front side. The discharge oil passage 57c axially faces the discharge side region DA of the pump rotor 47 shown in fig. 3.

In fig. 5, the central recess 57d is a circular recess centered on the central axis J. The center recess 57d receives the front end of the shaft (12 in fig. 2).

The front side discharge oil passage 57e has a recess 57e1 and a through hole 57e 2. The recess 57e1 of the front side discharge oil passage 57e is disposed on the + Y side of the rotor chamber 57a, and is recessed from the rear end surface of the 1 st main body 57 toward the front side. The through hole 57e2 of the front side discharge oil passage 57e axially penetrates from the bottom surface of the recess 57e1 toward the front side.

The discharge port 57f, the inflow port 57g, and the detection port 57h each constitute a part of the spool valve 65 shown in fig. 4. In fig. 5, only the recess 57h1 of the detection port 57h is shown, but as shown in fig. 2, the detection port 57h further has a through hole 57h 2. The recess 57h1 of the detection port 57h is recessed from the end surface on the rear side of the 1 st body 57 toward the front side. The through hole 57h2 of the detection port 57h axially penetrates from the bottom surface of the recess 57h1 toward the front side.

As shown in fig. 5, the inflow port 57g and the discharge port 57f are recessed portions that are recessed from the end surface on the rear side of the 1 st body 57 toward the front side, respectively.

The annular groove 57i is a recess recessed from the rear end surface of the 1 st body 57 toward the front side. The annular groove 57i surrounds the rotor chamber 57a, the suction oil passage 57b, the discharge oil passage 57c, the center recess 57d, the front discharge oil passage 57e, the detection port 57h, the inflow port 57g, and the discharge port 57f on the rear end surface of the 1 st main body 57.

As shown in fig. 1, the circular centers of the cylindrical motor case 13 and the electric cover 14 of the motor unit 10 are located at the same position as the center axis J. On the other hand, in fig. 5, the center axis J is located at the circular center of the circular central recess 57 d. As shown in the drawing, the center of the annular groove 57i is located at a position deviated from the circular center of the central recess 57 d. That is, the center of the annular groove 57i of the 1 st body 57 is located at a position deviated from the axis of the shaft 12 shown in fig. 2.

(2 nd body 52)

Fig. 6 is an exploded perspective view of the electric oil pump 1 showing a state in which the pump section 40 is exploded. The 2 nd main body 52 of the pump section 40 is adjacent to the motor case 13 of the motor section 10 from the front side in the axial direction. The 2 nd main body 52 has a 1 st communication oil passage 52a, a 2 nd communication oil passage 52b, a rear side discharge oil passage 52c, and an annular groove 52 d.

The 1 st communication oil passage 52a is a recessed portion recessed from the front end surface of the 2 nd main body 52 toward the rear side. The 1 st communication oil passage 52a has an arc shape extending in the circumferential direction around the central axis J. The 1 st communication oil passage 52a axially faces the suction-side region SA shown in fig. 3.

In fig. 6, the 2 nd communication oil passage 52b is located on the + Z side of the 1 st communication oil passage 52a, and is a recessed portion recessed from the front end surface of the 2 nd main body 52 toward the rear side. The 2 nd communication oil passage 52b has an arc shape extending in the circumferential direction around the central axis J. The 2 nd communication oil passage 52b axially faces the discharge side region DA shown in fig. 3.

As shown in fig. 6, the rear side discharge oil passage 52c communicates with the 2 nd communication oil passage 52 b. The rear side discharge oil passage 52c is a recess recessed from the front side end surface of the 2 nd main body 52 toward the rear side. The rear side discharge oil passage 52c has a shape extending in the Z axis direction from the communication portion with the 2 nd communication oil passage 52b to the + Z side.

The annular groove 52d is disposed near the outer edge of the front end surface of the 2 nd body 52 and surrounds the 1 st communication oil passage 52a, the 2 nd communication oil passage 52b, and the rear discharge oil passage 52 c.

An intake port 57j, a discharge port 57k, a detection port 57m, and a discharge port 57n are provided on the front end surface of the 1 st body 57. The suction port 57j communicates with the through hole 57b2 of the suction oil passage 57b shown in fig. 5. The discharge port 57k communicates with the through hole 57c2 of the discharge oil path 57c shown in fig. 5. The detection port 57m communicates with the through hole 57h2 of the detection port 57h shown in fig. 2. The discharge port 57n communicates with the through hole 57e2 of the front side discharge oil passage 57e shown in fig. 5.

A partition plate 58 is disposed between the 1 st body 57 and the 2 nd body 52 in the axial direction. As shown in fig. 2, the partition 58 is sandwiched between the 1 st body 57 and the 2 nd body 52.

Fig. 7 is an exploded perspective view of the electric oil pump 1 showing a state in which the pump section 40 is exploded from a different angle from fig. 6. As shown in fig. 6 and 7, the partition plate 58 has a center opening 58a, a suction-side opening 58b, a discharge-side opening 58c, a discharge opening 58d, a 1 st positioning hole 58e, and a 2 nd positioning hole 58 f.

The central opening 58a is a circular opening centered on the central axis J. The shaft 12 of the motor portion 10 passes through the central opening 58 a.

The suction-side opening 58b is an arc-shaped opening extending in the circumferential direction around the central axis J. The suction-side opening 58b functions as follows: the suction-side region (SA of fig. 3) of the rotor chamber (57 a of fig. 5) disposed in the 1 st body 57 is communicated with the 1 st communication oil passage 52a disposed in the 2 nd body 52.

The discharge-side opening 58c is an arc-shaped opening extending in the circumferential direction around the central axis J. The discharge-side opening 58c functions as follows: the discharge side region (DA in fig. 3) of the rotor chamber (57 a in fig. 5) disposed in the 1 st body 57 is communicated with the 2 nd communication oil passage 52b disposed in the 2 nd body 52.

The discharge opening 58d is a rectangular opening extending in the Z-axis direction. The discharge opening 58d functions as follows: the rear side discharge oil passage 52c disposed in the 2 nd main body 52 communicates with the inflow port 57g disposed in the 1 st main body 57. The positioning pins provided in the 1 st body 57 penetrate the 1 st positioning hole 58e and the 2 nd positioning hole 58f, respectively.

When the pump rotor 47 rotates, the external oil is sucked into the suction oil passage (57 b in fig. 5) through the suction port 57j of the 1 st main body 57, and reaches the rotor meshing portion in the suction side area SA of the rotor chamber (57 a in fig. 5). Further, a part of the oil passes through the suction-side opening 58b of the partition plate 58 from the meshing portion and reaches the 1 st communication oil passage 52a of the 2 nd main body 52. The oil in the suction oil passage (57 b in fig. 5) and the oil in the 1 st communication oil passage 52a move toward the discharge side area DA of the rotor chamber (57 a in fig. 5) as the pump rotor 47 rotates. Then, the oil in the suction oil passage (57 b in fig. 5) and the oil in the 1 st communication oil passage 52a pass through the meshing portion of the pump rotor 47, and reach the discharge oil passage (57 c in fig. 5) disposed in the 1 st body 57 or the 2 nd communication oil passage 52b disposed in the 2 nd body 52.

The oil in the 2 nd communication oil passage 52b of the 2 nd main body 52 is gradually pressurized and reduced in volume with the rotation of the pump rotor 47, and passes through the meshing portion of the discharge side region (DA of fig. 3) of the rotor chamber (57 a of fig. 5) to reach the discharge oil passage 57c of the 1 st main body 57. The oil in the discharge oil passage 57c of the 1 st body 57 passes through the discharge port 57k and is discharged to the outside.

The oil in the rear side discharge oil passage 52c of the 2 nd main body 52 is pushed to the + Z side by the oil in the 2 nd communication oil passage 52b during normal operation (when a pressure rise described later is not caused), but stays in the rear side discharge oil passage 52 c.

A branch pipe from a discharged oil receiving pipe provided in an object to which an electric oil pump such as a transmission of a vehicle is mounted is connected to a detection port provided in a front end surface of the 1 st main body 57. When the pressure of the oil in the discharge oil receiving pipe is excessively high (pressure rises), the pressure of the oil in the detection port 57h of the 1 st main body 57 also increases. Then, the oil in the detection port 57h moves the spool valve body 65b to the opposite side of the arrow α in fig. 4 against the urging force of the coil spring 65c shown in fig. 4. The spool valve body 65b thus moved communicates the inflow port 57g and the discharge port 57f shown in fig. 5 and 7. Then, the oil in the 2 nd communication oil passage 52b of the 2 nd main body 52 shown in fig. 6 passes through the discharge opening 58d of the partition plate 58 and enters the inflow port 57g of the 1 st main body 57.

The oil that has entered the inflow port 57g of the 1 st body 57 passes through the discharge port 57f, reaches the inflow side of the check valve 66 shown in fig. 4, and moves the check valve body 66b in the direction opposite to the arrow β direction in fig. 4. Then, after the oil moves from the inflow side to the outflow side of the check valve 66, the oil is discharged from the discharge port 57n shown in fig. 6 via the front side discharge oil passage 57e shown in fig. 5 and 7. If the oil is continuously discharged from the discharge port 57n, the pressure of the oil in the pump section 40 decreases as a whole, and the discharge pressure of the oil from the discharge port 57k decreases. Then, the pressure of the oil in the discharge oil receiving pipe and the branch pipe of the mounting object such as the transmission is lowered, and the spool 65b shown in fig. 4 is moved in the arrow α direction by the biasing force of the coil spring 65 c. Then, the discharge of the oil from the discharge port 57n is stopped.

The rear discharge oil passage 52c of the 2 nd main body 52 shown in fig. 6 is originally required to be provided in a state of an undercut groove that is not open toward the front side in the axial direction, but is provided as a recess as shown in the drawing. The rear surface of the partition plate 58 closes the opening of the rear discharge oil passage 52c, and the rear discharge oil passage 52c is in the same state as the undercut groove. In the electric oil pump 1, the rear side discharge oil passage 52c in the recessed state can be molded by a mold, and therefore, the molding cost of the 2 nd main body 52 can be reduced as compared with the case of molding as an undercut groove.

An annular 2 nd seal member 60 made of a fluororesin is disposed between the 2 nd body 52 and the separator 58 in the axial direction. The annular groove 52d of the 2 nd main body 52 receives the axial rear side of the 2 nd seal member 60. The 2 nd seal member 60 has a front portion in the axial direction projecting from the front end surface of the 2 nd main body 52 toward the front side in a state where the rear portion in the axial direction is fitted into the annular groove 52d of the 2 nd main body 52. When the partition plate 58 is pressed toward the 2 nd body 52 by bolt-fastening the 2 nd body 52 to the 1 st body 57, a portion of the 2 nd seal member 60 on the front side is elastically deformed so as to expand in the Y-Z direction between the 2 nd body 52 and the partition plate 58. By the above elastic deformation, the space between the 2 nd body 52 and the partition plate 58 is sealed.

The discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e of the 1 st body 57 shown in fig. 7 are all provided as recesses, although they are essentially required to be provided in a state of being undercut grooves that are not open toward the rear side in the axial direction. The front surface of the partition plate 58 closes the openings of the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e, and the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e are in the same state as the undercut groove. In the electric oil pump 1, the discharge port 57f, the detection port 57h, and the front side discharge oil passage 57e in the state of the recessed portion can be molded by a mold, so that the molding cost of the 1 st main body 57 can be reduced as compared with the case of molding into an undercut groove.

An annular 1 st seal member 59 made of a fluororesin is disposed between the separator 58 and the 1 st body 57 in the axial direction. The annular groove 57i of the 1 st body 57 accommodates the axial front side of the 1 st seal member 59. The 1 st seal member 59 has a front portion in the axial direction projecting from the rear end surface of the 1 st main body 57 toward the rear side in a state where the front portion in the axial direction is fitted into the annular groove 57i of the 1 st main body 57. When the partition plate 58 is pressed toward the 1 st body 57 by bolt-fastening the 2 nd body 52 to the 1 st body 57, a portion on the rear side of the 1 st seal member 59 is elastically deformed so as to expand in the Y-Z direction between the partition plate 58 and the 1 st body 57. By the above elastic deformation, the space between the partition plate 58 and the 1 st body 57 is sealed. In addition, the 1 st seal member 59 has a larger diameter than the 2 nd seal member 60. In other words, the diameter of the 2 nd sealing member 60 is smaller than that of the 1 st sealing member 59.

As shown in fig. 6 and 7, the 1 st body 57 and the 2 nd body 52 each have 3 bolt holes BH through which bolts for bolting the 1 st body 57 and the 2 nd body 52 to an attachment object such as a transmission are passed, in each flange portion. The spacer 58 also has 3 bolt holes BH through which the bolts pass.

Fig. 8 is a perspective view showing the 1 st body 57. As shown in fig. 8, the axial front end surface of the 1 st body 57 and the front surface of the flange portion of the 1 st body 57 are flat surfaces having no irregularities. In the electric oil pump 1, the front surface of the flange portion of the 1 st body 57 is a mounting surface 57p that is closely attached to a surface to be mounted. The mounting surface 57p is provided with a positioning recess 57q as a positioning portion for positioning the electric oil pump 1 with respect to a mounting object. The positioning recess 57q is recessed toward the rear side in the axial direction from the mounting surface 57 p. Positioning of the electric oil pump 1 with respect to the mounting object is completed by inserting positioning pins provided on the mounting surface of the mounting object such as the transmission into the positioning recesses 57q of the 1 st main body 57.

The 1 st body 57 has: a circular 1 st projecting portion 57r projecting from the attachment surface 57p toward the axial front side; and a 2 nd projecting portion 57s projecting from an end surface on the axial front side of the 1 st projecting portion 57r toward the axial front side. The circular shape is a shape having a circular outer edge in cross section, and is, for example, a cylindrical shape, a disk shape, or the like. The 2 nd projection 57s is arranged radially inward of the circumference of the circular 1 st projection 57 r. The positioning concave portion 57q is arranged between the 1 st convex portion 57r and the bolt hole BH located most outward in the radial direction with the center point of the diameter of the 1 st convex portion 57r as the center, out of the 3 bolt holes BH provided in the 1 st body 57.

The electric oil pump 1 is designed on the premise that a circular opening or recess into which the 1 st and 2 nd convex portions 57r and 57s of the 1 st body 57 enter is provided on a mounting surface to be mounted. Specifically, in the electric oil pump 1 in which the 1 st projection 57r and the 2 nd projection 57s are inserted into the circular opening or recess of the mounting object, the end surface on the axial front side is brought into close contact with the connection plane disposed inside the mounting object. An oil delivery port for communicating with the suction port 57j, a discharge oil receiving port for communicating with the discharge port 57k, an opening for communicating with the detection port 57m (the port of the branch pipe described above), and a discharge oil receiving port for communicating with the discharge port 57n are provided on the above-described connection plane.

The suction port 57j, the discharge port 57k, the detection port 57m, and the discharge port 57n provided on the axial front side end surface of the 1 st main body 57 (the axial front side end surface of the 2 nd projection 57 s) are directed toward the axial front side. Further, the mounting surface 57p also faces the axial front side. The axial front end surface of the 1 st body 57 (the axial front end surface of the 2 nd projection 57 s) is in close contact with the connection plane of the mounting object in the mounting object.

When the electric oil pump is positioned with respect to the mounting object by the positioning recess 57q provided in the mounting surface 57p, the operator can perform the following operation without taking a special time and effort. That is, the suction port 57j of the 1 st body 57 can be made to communicate with the oil delivery port of the mounting object, and the discharge port 57k of the 1 st body 57 can be made to communicate with the discharged oil receiving port of the mounting object. Further, the detection port 57m of the 1 st body 57 may be made to communicate with the port of the branch pipe to be mounted, and the discharge port 57n of the 1 st body 57 may be made to communicate with the discharged oil receiving port to be mounted.

Thus, in the electric oil pump 1, piping work for communicating the suction port 57j of the 1 st body 57 with the oil delivery port to be mounted and piping work for communicating the discharge port 57k of the 1 st body 57 with the oil receiving port to be mounted are omitted. Further, piping work for communicating the detection port 57m of the 1 st body 57 with the port of the branch pipe to be mounted and piping work for communicating the discharge port 57n of the 1 st body 57 with the discharge oil receiving port to be mounted are also omitted. Therefore, according to the electric oil pump 1, the mounting workability when mounting the electric oil pump 1 to the mounting object can be improved.

The circular 1 st projection 57r has an annular groove 57t extending over the entire circumference of the circumferential surface. An annular 3 rd seal member is fitted into the annular groove 57 t. An object to which the electric oil pump 1 such as a transmission is attached is provided with a circular opening or recess for allowing the 1 st and 2 nd convex portions 57r and 57s of the 1 st body 57 of the electric oil pump 1 to enter. The gap between the inner peripheral surface of the opening or recess and the outer peripheral surface of the 1 st projection 57r entering the opening or recess is sealed by the 3 rd seal member fitted in the annular groove 57 t.

In addition, instead of the positioning concave portion 57q, a positioning convex portion such as a positioning pin may be provided as the positioning portion. When the positioning convex portion is provided on the mounting surface 57p of the electric oil pump 1, the positioning concave portion is provided on the mounting target surface.

< action and Effect of electric oil Pump 1 >

(1) The electric oil pump 1 includes a pump section 40 and a motor section 10 that drives the pump section 40. The pump section 40 is disposed on one side of the motor section 10 in the axial direction of the motor shaft of the motor section 10. The pump section 40 includes a pump rotor 47 and a pump body 51 that houses the pump rotor 47. The pump body 51 has a suction port 57j for sucking oil and a discharge port 57k for discharging oil. The pump body 51 has: a mounting surface 57p to which the electric oil pump 1 is mounted; and a positioning recess 57q which is a positioning portion for positioning the electric oil pump 1 with respect to the mounting object. At least one of the suction port 57j and the discharge port 57k is open toward the front side in the axial direction. The mounting surface 57p faces the front side. Positioning recess 57q is provided on mounting surface 57 p.

In the electric oil pump 1 having this configuration, when the operator positions the electric oil pump 1 with respect to the mounting object by the positioning recess 57q provided in the mounting surface 57p, the operator can perform the following operations without requiring a special labor. That is, the suction port 57j of the pump body 51 can be made to communicate with the oil delivery port of the mounting object, or the discharge port 57k of the pump body 51 can be made to communicate with the discharged oil receiving port of the mounting object. Thus, piping work for communicating the suction port 57j of the electric oil pump 1 with the oil delivery port to be mounted or piping work for communicating the discharge port 57k of the electric oil pump 1 with the discharge oil receiving port to be mounted is omitted. Therefore, according to the electric oil pump 1, the mounting workability when mounting the electric oil pump 1 to the mounting object can be improved.

(2) The suction port 57j and the discharge port 57k are respectively open toward the axial front side.

In the electric oil pump 1 having this configuration, both the piping work for communicating the suction port 57j with the oil delivery port to be mounted and the piping work for communicating the discharge port 57k with the discharge oil receiving port to be mounted are omitted. Therefore, according to the electric oil pump 1, the mounting workability when mounting the electric oil pump 1 to the mounting object can be further improved. Further, according to the electric oil pump 1, since a piping member for connecting the suction port 57j and the oil delivery port to be mounted is not required, the combination of the electric oil pump 1 and the mounting object can be made smaller and lighter without providing the piping member. Further, according to the electric oil pump 1, the piping member is not interposed between the suction port 57j and the oil delivery port to be mounted in the axial direction, and therefore the axial dimension of the combination of the electric oil pump 1 and the mounting object can be reduced.

(3) The pump body 51 has a circular 1 st projecting portion 57r projecting from the attachment surface 57p toward the axial front side. The suction port 57j and the discharge port 57k are disposed axially forward of the 1 st projection 57r and radially inward of the circumference of the circular 1 st projection 57 r.

In the electric oil pump 1 having this configuration, the 1 st circular protruding portion 57r is inserted into the inside of the mounting object or into the recess provided on the mounting surface of the mounting object through the opening provided on the mounting surface of the mounting object. The suction port 57j and the discharge port 57k are located radially inward and axially forward of the circumferential surface of the circular 1 st projection 57r inserted into the mounting object. Thus, when the 1 st projection 57r is inserted into the opening or recess of the mounting object, the suction port 57j and the discharge port 57k are also inserted into the opening or recess of the mounting surface of the mounting object. Therefore, according to the electric oil pump 1, the suction port 57j of the pump body 51 can be made to communicate with the oil delivery port of the mounting object among the mounting objects, and the discharge port 57k of the pump body 51 can be made to communicate with the discharged oil receiving port of the mounting object among the mounting objects. In the electric oil pump 1, the circular 1 st protruding portion 57r is inserted into the opening or the recess of the surface to be mounted of the mounting object, whereby the electric oil pump 1 can be held at the mounting position of the mounting object. Thus, according to the electric oil pump 1, the workability of mounting the electric oil pump 1 can be further improved.

(4) The circular 1 st projection 57r has an annular groove 57t extending over the entire circumference of the circumferential surface.

According to the electric oil pump 1 having this configuration, the annular seal member is fitted into the annular groove 57t, whereby the pump body 51 can be sealed against the inner wall of the circular opening or recess provided in the mounting surface to be mounted.

(5) The positioning recess 57q is disposed on the mounting surface 57p at a position radially outward of the annular groove 57t of the 1 st projection 57 r.

In the electric oil pump 1 having this configuration, the operator can position the electric oil pump 1 on the mounting object by the following simple operation. That is, first, the operator inserts a portion of the circular shape of the 1 st projection 57r of the pump body 51 on the front side in the axial direction (more specifically, a portion on the front side of the groove 57t of the 1 st projection 57r in the axial direction) into the opening or the recess of the mounting surface to be mounted. Next, the operator brings the outer peripheral surface of the 1 st projecting portion 57r into contact with the inner peripheral surface of the opening or the recessed portion, and manually rotates the electric oil pump 1 around the center point of the diameter of the 1 st projecting portion 57 r. Therefore, since the positioning recess 57q provided on the mounting surface of the pump body 51 is hooked to the positioning pin of the mounting object, the operator pushes the electric oil pump 1 in the axial direction toward the opening or the recess of the mounting object to be mounted surface when feeling the hooked touch with the hand. According to the electric oil pump 1, by the above-described simple operation (hereinafter, referred to as a simple positioning operation), the electric oil pump 1 can be accurately positioned with respect to the mounting object before the electric oil pump 1 is fixed to the mounting object.

(6) The attachment surface 57p has a plurality of bolt holes BH through which bolts for fixing the pump body 51 to an attachment object pass. The positioning concave portion 57q is arranged between the bolt hole BH located most radially outward with the center point of the diameter of the 1 st convex portion 57r as the center, and the 1 st convex portion 57r, among the plurality of bolt holes BH.

In the electric oil pump 1 having this configuration, a dead space is easily generated between the 1 st protruding portion 57r and the bolt hole BH positioned on the most radial direction outer side among the plurality of bolt holes BH provided in the attachment surface 57 p. According to the electric oil pump 1, by disposing the positioning recess 57q in the above-described dead space, it is possible to avoid providing the positioning recess 57q and increase the area of the mounting surface 57p, and thus it is possible to save space.

(7) The positioning portion is a positioning recess 57q recessed from the mounting surface 57p toward the rear side in the axial direction. The depth of positioning recess 57q is greater than the distance from attachment surface 57p to the axial front end of annular groove 57 t.

In the electric oil pump 1 having this configuration, the height of the positioning projection provided on the mounting surface to be mounted such as a transmission can be made larger than the distance from the mounting surface 57p of the 1 st body 57 to the end on the axial front side of the annular groove 57 t. Therefore, in the above-described simple positioning operation, when the operator manually rotates the electric oil pump 1 in a state where the mounting surface 57p of the 1 st body 57 is in contact with the positioning convex portion of the mounting target surface, the following state can be maintained. That is, the 3 rd seal member fitted into the annular groove 57t of the 1 st projection 57r is positioned on the rear side in the axial direction with respect to the mounting target surface, and the 3 rd seal member and the mounting target surface are in a non-contact state. According to the electric oil pump 1, by maintaining the above state, it is possible to avoid deterioration of positioning operability and damage to the 3 rd seal member caused by bringing the 3 rd seal member into contact with the mounting surface of the mounting object.

In the case where positioning convex portions are provided as the positioning portions of the mounting surface 57p of the 1 st main body 57 instead of the positioning concave portions 57q, the height of the positioning convex portions may be set to be larger than the distance from the mounting surface 57p to the end on the axial front side of the annular groove 57 t. In this configuration, similarly to the configuration in which the positioning recess 57q is provided, it is possible to avoid deterioration of positioning operability and damage to the 3 rd sealing member caused by bringing the 3 rd sealing member into contact with the mounting surface of the mounting object while maintaining the above-described state.

(8) The pump body 51 has a 2 nd projecting portion 57s projecting from the axial front end surface of the circular 1 st projecting portion 57r toward the axial front side. The 2 nd projection 57s is arranged radially inward of the circumference of the circular 1 st projection 57 r. The 2 nd projection 57s has a rotor chamber 57a that houses the pump rotor 47. The suction port 57j and the discharge port 57k are provided on the axial front end surface of the 2 nd projection 57 s.

In the electric oil pump 1 having this configuration, the pump rotor 47 and the rotor chamber 57a are provided in the 2 nd convex portion 57s, whereby the size of the 2 nd main body 52 disposed on the axially rearward side of the 1 st main body 57 is reduced in the axial direction. The 2 nd body 52 is disposed at a position on the rear side in the axial direction than the mounting surface 57p, and therefore the 2 nd body 52 is a portion that protrudes from the mounting target surface to be mounted toward the rear side in the axial direction. Thus, according to the electric oil pump 1, the size of the portion protruding from the mounting surface to be mounted in the electric oil pump 1 can be reduced.

While the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Claims (8)

1. An electric oil pump, comprising:

a pump section; and

a motor section that drives the pump section,

the pump section is disposed on one side of the motor section in an axial direction of a motor shaft of the motor section,

the pump section has a pump rotor and a pump body that houses the pump rotor,

the pump body has a suction port for sucking oil and a discharge port for discharging oil,

it is characterized in that the preparation method is characterized in that,

the pump body has:

a mounting surface to be mounted on a mounting object of the electric oil pump; and

a positioning portion that positions the electric oil pump with respect to the mounting object,

at least either one of the suction port and the discharge port is open toward one axial side,

the mounting surface faces one side in the axial direction,

the positioning portion is provided on the mounting surface.

2. The electric oil pump according to claim 1,

the suction port and the discharge port are open to one axial side, respectively.

3. The electric oil pump according to claim 2,

the pump body has a circular projection projecting from the attachment surface toward one axial side,

the suction port and the discharge port are respectively disposed on one axial side of the convex portion and radially inward of the circumference of the circular convex portion.

4. The electric oil pump according to claim 3,

the circular convex portion has an annular groove extending over the entire circumference of the circumferential surface.

5. The electric oil pump according to claim 4,

the positioning portion is disposed on the mounting surface at a position radially outward of the convex portion.

6. The electric oil pump according to claim 5,

the attachment surface has a plurality of bolt holes through which bolts for fixing the pump body to the attachment object pass,

the positioning portion is disposed between the boss and a bolt hole located radially outward from a center point of a diameter of the boss, among the plurality of bolt holes.

7. The electric oil pump according to claim 6,

the positioning portion is a positioning convex portion protruding from the mounting surface toward one side in the axial direction, or a positioning concave portion recessed from the mounting surface toward the other side in the axial direction,

the height of the positioning protrusion or the depth of the positioning recess is larger than the distance from the mounting surface to the end on one side in the axial direction of the groove.

8. The electric oil pump according to any one of claims 3 to 7,

the pump body has a 2 nd convex portion protruding from one axial end surface of a 1 st convex portion, which is a circular convex portion, toward one axial side,

the 2 nd convex part is arranged at a position radially inward of the circumference of the 1 st convex part in a circular shape,

the 2 nd projection has a rotor chamber that houses the pump rotor,

the suction port and the discharge port are provided on one axial end surface of the 2 nd projection, respectively.

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